Old favorites can disappear suddenly from the markets. Good peaches are hard to find in markets here. Haven't seen the juicy, sugary Elberta for a couple of seasons; they don't ship well.

I remember when Winesap apples were my favorite, not only for eating, but for well-flavored pies, etc. Now they are unobtainable in the market place, and the variety seems to have survived only in backyard otchards.
Golden Delicious now has a lot less flavor than in the past- it is totally bland.
A whole new batch of apples are on the market. Fuji came into the market, but is being supplanted here by Cripps, Pink Lady, and others of that ilk, which are good, but almost seem 'manufactured,' to my taste.
Granny Smith persists, esp. for cooking, but lacks the flavor and bite of the disappeared Winesap.
Only the lucky few have their own little orchards and can search out and grow their favorites.